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I estimate the wingspan to be +/- 4cm.
Prefers to spend 96% of its time just out of camera range. This one was flitting about a manicured lawn going from clover to clover while I stalked it like a escaped mental patient. I apologize for the drama, but...gug. From Butterfly Conservation (link to right): The Clouded Yellow is one of the truly migratory European butterflies and a regular visitor to Britain and Ireland. Although some of these golden-yellow butterflies are seen every year, the species is famous for occasional mass immigrations and subsequent breeding, which are fondly and long remembered as ''Clouded Yellow Years''. A small proportion of females are pale yellow (form helice), which can be confused with the rarer Pale and Berger's Clouded Yellows.
C. croceus might not be the exact species.